Write code snippet to retrieve IMEI number of Android phone ?

TelephonyManager class can be used to get the IMEI number. It provides access to information about the telephony services on the device.

       TelephonyManager mTelephonyMgr = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);

        String imei = mTelephonyMgr.getDeviceId();